21753892608 has 216 divisors, whose sum is σ = 67544813952. Its totient is φ = 6197409792.

The previous prime is 21753892561. The next prime is 21753892609. The reversal of 21753892608 is 80629835712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21753892609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18326191 + ... + 18327377.

It is an arithmetic number, because the mean of its divisors is an integer number (312707472).

Almost surely, 2^21753892608 is an apocalyptic number.

21753892608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21753892608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33772406976).

21753892608 is an abundant number, since it is smaller than the sum of its proper divisors (45790921344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21753892608 is a wasteful number, since it uses less digits than its factorization.

21753892608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 21753892608 in words is "twenty-one billion, seven hundred fifty-three million, eight hundred ninety-two thousand, six hundred eight".